Ravi and Kumar
are working on an assignment. Ravi takes 6 hours to type 32 pages on a
computer, while Kumar takes 5 hours to type 40 pages. How much time will
they take, working together on two different computers to type an
assignment of 110 pages?
A
20 hours
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B
5 hours 40 minutes
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C
8 hours 15 minutes
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D
23 hours
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Solution
The correct option is B8 hours 15 minutes Number of pages typed by Ravi in 1 hour=326=163 Number of pages typed by Kumar in 1 hour=405=8 Number of pages typed by both in 1 hour=(163+8)=403. ∴ Time taken by both to type 110 pages=(110×340)hours. =814 hours (or) 8 hours 15 minutes..